When I put it back together it still was not pumping water. Nissan 5hp Outboard - solved strange problem Article By Shorty Really Strange Outboard Problem A freind of mine was given this Nissan (Tohatsu) 5hp, 2 stroke, long shaft outboard motor. When an outboard motor runs at speed but cannot hold an idle, it usually indicates a problem with the carburetor. As was mentioned in the previous discussions, the cause could be something as simple as a gasket or seal that was improperly assembled during manufacture. I inspected the lower unit, the impeller is in new condition and there are no obstructions. that motor has a thermostat that opens at I believe 180 deg, at idle with cold engine you may only see a dribble, after it gets warmed up you will see intermitant peeing as the thermostat opens and closes, at throttle you should see good water. How about posting the make, model, and year of the overheating motor? When my water pump starts getting tired ([in the] third year [of operation]), my 200-HP Mercury starts to run warmer at idle speeds but still runs cool at on-plane … Outboard water pumps are not made to lift water. The impeller blades will warp over time/use and become much less efficient. A bad outboard water pump will produce lower water pressure than normal. We recently changed the thermostat and water pump. Another thing: thermostats rarely go bad in pairs. I have taken it apart a few times but see no problem. Install a cooking thermometer into the water and put in the thermostate. My Merc 30 HP 4 stroke shoots a steady stream from start up. The outboard can stop pumping water out the tell-tale, begin to overheat, restrict the available RPM allowed, and cause significant damage if not corrected. There are several methods to troubleshooting a stalling outboard engine. When the motor runs it does not seem to pump water. I have a 25 HP Mercury outboard and I think it is a ’93 or ’94 but not too sure. This would confirm that replacement of the powerhead cured the problem of overheating with the 250-HP Mercury VERADO engine and that the true source of the problem was a defect in the manufacture of the powerhead. So I replaced the water pump on this merc, reinstalled the lower unit and I've got a couple problems that might be related. The Smartcraft gauge notification was given in the narrative: "engine overheat check water intake." Nothing seems to be bloking the intake. 1) Check the Water Pump Impeller The water pump impeller is the cause of most water circulation and overheating problems. So it is always peeing. Is this normal? Everything seemed fine with the motor in gear – nice flow but when I would put it in neutral it sometimes slowed to a trickle. It used to be standard maintenance on Merc engines to change the water pump impeller every other year. So I replaced the water pump on this merc, reinstalled the lower unit and I've got a couple problems that might be related. I also have to think that the Smartcraft system would display the engine temperature reading, although there is no mention of what the actual engine temperature readings were. The impeller is supposed to be off center in the water pump. The water pump is working because it streams water ok. They have a replacement kit to upgrade the fuel pump. The impeller is essentially a small, round disc with spinning blades used to move water through the circuit of the outboard motor. At high idle it works ok, i guess im used to a pretty healthy stream coming out of other outboards. After that it was hard to start and there still wasn't any water. It is likely that an aural alert accompanied this visual warning message. In the future inform your mechanic before they start the repair work that you will be taking not only your repaired boat but your used "worn out parts" with you. $27.99 $ 27. The outboard can stop pumping water out the tell-tale, begin to overheat, restrict the available RPM allowed, and cause significant damage if not corrected. My 70 pees a pretty steady stream most of the time. I have a 1997 Mercury 150 EFI outboard that I just bought. I have not … A bad outboard water pump will produce lower water pressure than normal. I know this stinks, the old way of looking for a good stream of water means about nothing with this engine, I have a 96 and don't get me wrong they are a great motor, do yourself a favor and install a water pressure gauge so you can see what is going on. I replaced the water pump gaskets and impeller, and put on a new prop first thing. I have a few Evinrude and Johnson motors that I tinker around with, but I have never worked on a Mercury. Hi guys, thanks for having such a great forum! I have a 1997 Mercury 150 EFI outboard that I just bought. I was wondering how much water should be coming out the pee hole at idle. The serial # is 3884074. It is very likely your alarm is a valid over-temperature alarm and you have a malfunction in the cooling system. The water pump impeller of any outboard motor needs to be serviced on a regular basis, a task that if overlooked can lead to big trouble. A downloadable version of the factory manual is available from this site. Try running it in neutral without the intake grates on. Powered by: Ultimate Bulletin Board, Freeware Version 2000Purchase our Licensed Version- which adds many more features! Tried compressed air at the pick up tube and at the pee hole at it seemed fine. Black max is not spitting water out of the pee hole at idle The old impeller is all there. Second there is a suggestion of a remedy, "check water intake." I'm new to outboard repair, and don't have a lot of experience with them. Mercury Marine's tiller handle assembly for the 15 and 20hp portable outboard motors won the 2018 award in the "Propulsion Parts" category at the annual International Boatbuilders' Exhibition & Conference (IBEX). I would imagine they are all setup this way so you can check if the pump is working no matter if the motor is cold or hot. profile | register | author help, Prepare a pan of water deep enough to cover the thermostat completely. Also, has the boat actually been operating with the new powerhead on the engine? This is a flushing fitting hole. It is a combination of volume and pressure. search | FAQ | Had it fixed and it ended up being zebra mussels in the power head clogging the cooling passages. I am very cautious about sand now. Either side it cools off but in this range it warms up fast. Mercury 1998 90 hp 2 stroke Not rated yet When running the boat in idle or slow no alarm sound when try to get up on Plain solid loud alarm sound oil is full and water pump is brand new and pumping … Consult your owner's manual to check items that may be unique to your motor. Createshao Outboard Water Pump Kit for Mercury Mercruiser Alpha One Boat Engine 47-43026Q06 40-250 HP Sierra 18-3214. It’s highly recommended to follow the idle mixture adjustment procedures in the factory repair manual. . As for whether or not it should be pumping water at low RPM, well it varies. Heat the water while watching temperature; the thermostate should remain closed until the water reaches the temp the thermostat is designed to operate, [most likely in the temperature range of the] upper 100 [probably means in the range of 150-degrees-F to 190-degrees-F] [Editor's note: many outboard engines target 140-degrees-F as the normal warm operating range--jimh]. This may be first noticed by an intermittent stream at idle with a warmed up motor. Took the water pump apart 3 times and lower unit about 7 times off. Re: 1984 mercury outboard 7.5hp not pumping water I had the same problem. shallow recess that has a 1/8" plastic seal where the water passage goes into the block. I have replaced the water pump impeller on a 2007 115HP 4 stroke Mercury outboard. I also make the inference that the overheat problem was occurring even when the engine was being run on land during testing. Today in 50 degree water it peed from the start up and I'm sure it being a 4 stroke, has a thermostat. … read more My 2002 Mercury 150 Saltwater outboard does not pump water at headway speed. Increasing speed from 5 to 9 miles per hour starts the cooling process. Mercury notes that this procedure should be used when flushing the engine after use in salty or dirty water, and also as a part of preparing the outboard … The Smartcraft message appears to contain two elements. I have had some intermittant problem so I'm going to put it in , the service advisory is number 99-5. By the way, the cooling system on Mercury motors often needs annual maintenance of the rubber impeller. It's a 40 hp four stroke, 2006 model. water is not pumping out of the water pump hole on my Mercury 50 2 stroke. Most outboard maintenance schedules call for inspection of the impeller every 100 hours, or once a year. These idle mixture adjustment tuning procedures apply the Mercury outboards manufactured between 1965 thru 1989—specifically 45-HP to 115-HP models. It will not crank in neutral. If Mercury Precision or Quicksilver 2‑Cycle Outboard Oil is not available, substitute another brand of 2‑Cycle outboard oil that is NMMA Certified TC‑W3. I have only had the boat for a short while. 99. When I give it a little gas (1500 RPM's), it comes out in a steady stream. The engine can be running or not when flushing, and flushing should be for at least three minutes. I have followed the shop manual and replaced the impeller and gaskets. Choosing the right Mercury outboard water pump or Mercury outboard impeller can be a real hassle, so go ahead and reach out to one of Wholesale Marine’s dedicated customer service representatives. Water Passage Thru Motor : The water is pushed up from the water pump thru a 3/8 OD copper tube to the bottom engine cowling where it sets into a 1/2" dia. If Mercury engineers are curious, they may have the powerhead torn down to investigate further to see if they can discover the actual cause of the overheat problem. The previous owner barely put 20 I dont know if all Mercs are setup this way, but on my 15hp the waterpump tattle tale is before the thermostat (between the pump and the stat). Our Mercury outboard motor has troubling idling and cuts out. Given the expense incurred by Mercury in providing a complete new powerhead, the Mercury engineers must have felt that the overheat problem was due to a defect in the manufacture of the VERADO engine. Outboard EFI engines operate on the fuel injection strategy called . Water Sensor n) Pulse Fuel Pump o) From Fuel Tank p) From Oil Pump q) Vapor Separator r) (NOT USED) s) Vapor Separator Float t) Electric Fuel Pump u) (NOT USED) v) (NOT USED) w) Final Filter … First there is notice of the problem, "engine overheat." -If the thermostat is stuck open it needs replacing. Outboard motor designs vary depending on make and model, but all operate on similar principles. Re: 82 mercury 150. But at idle (750-1000 RPM's, little to none comes out the pee hole. When an outboard motor runs at speed but cannot hold an idle, it usually indicates a problem with the carburetor. Off The Water Maintenance/Repairs : To flush the motor, there is a 3/8" stainless bolt head on the LH side just below the juncture of the motor's midsection and where it bolts to the jet lower unit. -The thermostat should begin opening and be completely open at by 195-degrees-F. Consult your owner's manual to check items that may be … Make sure the key is in the impeller and the impeller is turning correctly with the shaft. Not gonna suck anything up in the few minutes you do it. There are three reasons your outboard motor's impeller won't pump. The first is that the water stream fitting -- the outlet hole for an outboard motor's cooling system -- is clogged. In this video I quickly go through how to testing the water pump in an outboard motor. Apparently the actual cause of the overheating problem at idle was never determined. more